Pump controller



1, 1 8 March 1 1927' v P. A. BANCEL ET AL 1 909 PUMP CONTROLLER Filed March 2'7, 1923 mvENToRS paulA-Bancel Jofin r an THUR ATTO EY Patented Mar. 1 1927.

PAUL A. BANCEL, OF NUTLEY, AND JOHN" PATENT 1 OFFICE.

F. KIRGAN, OF PHILLIPSBURG, NEW JER- SEY, ASSIGNORS TO INGEBSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A

CORPORATION OF NEW JERSEY.

PUMP CONTROLLER.

Application filedjtarch 27, 1923. Serial No. 627,990.

This invention relates to pump controllers, and the objects of the invention are to enable the operation of a pump to be stopped automatically under certain condi- 5 tions, as for instance, when the nozzle pressure supplied from the pump falls below a certain pre-determined value or increases beyond a certain maximum value.

Further objects of the invention will hereinafter appear, and the invention is illustrated in its preferred form in the accompanyingdrawings in connection with a con-- denser, in which' I Y Y Figure 1 is a side elevation partly in longitudinal section showing a pump controller as applied to the pump ofa condenser, and Fig. 2 is a longitudinal sectional View of the valve controlling the',operation of the pressure operating plungen.

Referring to the drawings, the condenser shown as an illustrative example comprises a casing having an upper section or inlet head A, the lower section or body B, a diffuser C having a contracted throat Dat the outlet of the body, and a tailpiece E, partially submerged in. the usual tank or sump F, having a wire G and an over-flow pipe H. A water head J carries the nozzles K which direct convergent streams ,of water to the throat D of the condenser, and one or more combining tubes L, having guide vanes O surround the jets. Steam enters at the steam inlet P and the inlet head is provided with the man hole cover Q.

Water is supplied to the water head through the water supply intake pipe R, to which the injection pump S is connected and driven in this instance, by the electric motor T, s own as a direct current, shunt wound motor, supplied from the. mains U and V. The construction of,the regulator is such that the pump is automatically stopped at certain pre-determined low and high nozzle pressures..- v

The regulator casing 9' contains the plunger 0 and has one head connected by the pipe p to the watersupply intake pipe R. The opposite end of the regulator casing j is connected by the pipe 9 to the water supplyintake pipe Band in this pipe 9 is placed a normallyv closed relief valve 1' which opens under pre-determined pressure. A section of the relief valve 1' is'shown in Figure 3 and comprises a valve member 2 which is pressed against by the spring 3 having a tension substantially equalto the normal discharge pressure of. the pump S. A spring 8 is compressed between the plunger 0 and the regulator casing, and within the casing is a passage t leading to the interior of the condenser. body B. A port it leadsfrom the passage t toatmosphere-and is controlled b a suitable valve xv on the stem w of the p unger 0. An electric switch a: on the stem w cooperates with the contacts 4 in the circuit of the solenoid e.

Upon the decrease of nozzle pressure in the condenser, to a pre-determined degree, the spring 8 will force the plunger 0 out Wardly in the regulator casing, thus opening the passage t from the condenser to atmos-- phere through the. port a and at the same time Will close contact between the switch a: and the contact y thus energizing the solc- I noid e. The circuit breaker f will be actuated to break the circuit 9 of the motor at the contact h, which will stop the motor.

Uponan increase of pressure in the water supply intake pipe R, beyond a pre-determined value, due for instance to clogging of the nozzles, the pressure on one side of the plunger '0 through the pipe 9 will overcome the resistance of the spring 3 and will force the valve 2 from its seat thus admitting water under. pressure to the lower side of plunger 0 and this pressure plus the pressure of the spring 8 will overcome the'p'ressure on the opposite side ofthe plunger through the pipe p, so that the plunger 0 will be forced outwardly in the regulator;

casing y' and the vacuum in the condenser will be broken while at the same time, the

motor will be stopped.

This type of a paratus is for use prima ril as a safety th1s type, the motor T for driving the pump S'is generally runat full load for the sake of economy in operation. Economy in operating .a pump is just as desirable as economy and efficiency in the operation of the condenser and, therefore, if the pump were run at lower eificie'ncy', this loss would offset other gains in efiiciency in the operation of the condenser. The motor T for operating the supply .pump S operates constantly and it is seldom that there is a substantial variation in the discharge ressure of the pump. These variations may e caused in a number eVice. In installations of 1 of ways, such as stoppage of the nozzles K by leaves or other foreign matter, or by decrease in the electric voltage for driving the motor T. In either case the jets K do not discharge sufficient water or at high enough velocity to produce the desired ejector action at the throat of the diffuser C leading from the condenser casing B. This causes the easing to fill up almost immediately from the water pumped into it and from water sucked up through the diffuser C. Water thus is drawn up into the steam discharge pipes and into the steam operated machinery which may wreck the plant. Such an occasion as this might never happen. On the other hand, it is apt to happen at any time and the damage is so great that it is always advisable to install a device of this type for the sake of safety. It is not practical to speed up the pump so as to increase the pressure since the stoppage of the jets may be such that no reasonable increase in pressure will produce the desired result. F urthermore, the use of a high powered motor operating at less than its rated capacity is not economical and the loss in efficiency effects the total efficiency of the condensing apparatus.

We claim:

1. In a pump controller, the combination of a motor driven pump and discharge line, 1

a spring pressed pressure responsive regulator connected on opposite sides to the discharge line, a normally closed relief valve in thatconnection leading to the portion of 1 vby the regulator whereby the circuit conroller is held in a given position by predetermined pressure in the discharge line, but is actuated to control the motor upon a decrease or'increase of said predetermined discharge line pressure.

2. In a pump controller, the combination with a pump and discharge line, an electric motor for the pump, a circuit controller for the motor, a regulator casing having a spring pressed plunger normally tending to close the circuit controller, a pressure fluid connection from the discharge line to the regulator casing opposing the spring whereby the circuit controller is held open by predetermined pressure in the discharge line, but permits the spring to close the circuit controller upon decrease of pressure below that predetermined amount and stop the motor, discharge line to the regulator casing assisting the spring and a normally closed. relief valve in said connection, whereby discharge pressure in excess of said predetermined amount will cause the regulator plunger to close the. circuit controller and stop the mo tor.

In testimony whereof we have signed this specification.

PAUL A, BANOEL. JOHN F. KIRGAN.

a pressure fluid connection from the 

